De Cecilio de Carlos, Roberto (2019) Pupil Size Manipulation in Covert Attention to Red and Blue Contrasts: Study and Application in a Human Computer Interface. Master's Thesis / Essay, Human-Machine Communication.
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Abstract
The size of the pupil can be modulated by manipulating brightness in covertly attended stimuli. This has allowed the development of Human Machine Interfaces that can take commands by recording changes in pupil size thanks to this manipulation. However this research has been limited to brightness as the factor to alter, as luminance is the main variable in pupil dilation. However, there are many other properties of light that should be considered. Here we decided to test colour, as the response of melanopsin in ipRGCs response varies with the amplitude of light and it has been suggested to be at least partially in control of the pupillary light response. Similarly, melanopsin from ipRGCs has been associated with covert attention. Here we present two experiments in order to observe if colour affects covert attention and can be measured with changes in pupil dilation. The first one used a Posner cuing task, while the second compared performance in a pupil size based Human Machine Interface between two versions, one using colour and the other one not. Our results, while not being fully conclusive on covert attention to colour being a measurable factor in pupil, did show a clear improvement in performance. Hence colour can be used to improve Brain Computer Interfaces that use covert attention as an input and is very likely to modulate the pupillary light response.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Borst, J.P. and Mathot, S. |
| Degree programme: | Human-Machine Communication |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 15 Aug 2019 |
| Last Modified: | 19 Aug 2019 12:17 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/20678 |
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